I've just got some fulcrum 5, put them on yesterday and went for a ride, it actually felt more difficult than with my shimano 501's, saying that I didn't have my track pump to fully inflate the tyres and it was after work.
Pumped them up properly for the ride to work this morning and still can't decide if they're any better for the money.
Paid £200 from wiggle , deal included Michelin tyres and 6 tubes.